Improvement in coal-screens



(154 2 Sheets--Sheet 1.

THOMAS FARROW.

Improvement in Coal Screens.

No.122,58 9. F741 tentedjan.9,1872.

THOMAS FARROW, OF LINCOLN TOWNSHIP, PENNSYLVANIA.

IMPROVEMENT IN COAL-SCREENS.

Specification forming part of Letters Patent No. 122,589, dated January9, 1872.

To all whom it may concern:

Be it known that I, THOMAS FARROW, of Lincoln township, county ofAllegheny, State of Pennsylvania, have invented a certain new and usefulImprovement in Apparatus for Screening Coal; and I do hereby declarethat the following is a full, clear, and exact description thereof,reference being had to the accom-' panying drawing and to the letters ofreference marked thereon.

The nature of my invention consists in a series of screens and chutesprovided with gates. said screens and gates so arranged with relation toeach other that in screening the coal the slack shall be separated fromthe lumpcoal and the screens automatically reset themselves and closetheir gates.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and operation.

In the accompanying drawing which forms part of my specification, Figure1 is a side elevation of my improvement in apparatus for screening coal.Fig. 2 is a top view or plan of the same, representing the floor uponwhich the weighingscales rest removed. Fig. 3 is an end view of theapparatus, representing one of the upper end timbers of the frame-workremoved. Fig. 4 represents the upper portion of the frame-work cut away,showing a top view of the slack-chutes.

In the accompanying drawing, A represents the frame-work of theapparatus, to which, at one end, are pivoted the screens A and B, thefront ends of which are suspended to the crosstimber d by means ofchains f, their front ends extending over the back ends of theweighingchutes D and E, which are suspended to the platform of theweighing-scales B through the medium of rods 8 and chains 9. The screensA and B and weighing-chutes D and E are provided with gates a, which aresuspended to the frame-work A by means of chains 19.

The gates n are provided with arms 0, which are pivoted to the sides ofthe screens A B and the chutes D E. The screens A and B are providedwith bales l, to which is attached rope 2, whichpass up over pulleys lpivoted in standards 3, which rope is wound around drum in, which ispivoted between cross-timbers c, and is provided with a brake-band, y,attached to a lever, t, pivoted to one of the cross-timbers c. To theouter end of the lever t is attached a rod, .9, the lower end of whichis attached to a brake-lever, a, pivoted at m, the forward end of thelever being held in the desired position by a ratchet, '0. The front endof the chutes D and E are provided with screens m, and to the back endof them are attached arms It, to which are suspended weights 4. 0represent the slack-chutes, the front ends of which are supported onuprights h. The lower ends of the chutes U are provided withsliding-gates f, the front edge of which is provided with arms 1, whichproject downward. To their back edge are attached levers k, which areconnected to levers i arranged on shafts e, which have their bearingssecured to the uprights h. To one end of the levers a are attached ropesy, which pass over pulleys s, and to their lower end are attachedWeights 5. The screens A and B and chutes D and E are constructed ofheavy sheet-iron. The slack-chutes C may also be constructed ofsheet-iron, where durability is desired. 00 represents a coal-car.

The operation of my improvement in apparatus for screening coal is asfollows: The pitcar passes onto the platform a, and the coal is dumpedinto the screen A, and, passing down the inclined screen, the slack isseparated from the lump-coal and falls into the slack-chute O; and thelump-coal, leaving the screen A, falls into the weighing-chute D, thegreatest weight of the coal being in the front end of the chute. Asecond car of coal from the pit, passing onto the platform a, is dumpedinto the screen B, and the weight of the coal falling on the chute will,through the medium of the rope 2 and pulleys l, elevate the front end ofthe screen A, which will allow the frontend of the chute D to drop downfrom its gate a, and thereby allow the screened lump-coal to run out ofthe chute, and the weights 4 attached to arms 70 will raise up the frontend of the chute so as to close up against its suspended gate a. (Thecoal, prior to leaving the chutes D and E, is weighed through the mediumof the scales B, to the plat-form of which the chutes are suspended.)The coal which was dumped into the screen B has now passed down intothechute E; a third load of coal being emptied into screen A, its weightwill press down the screen and raise up the front end of screen 13,which will allow the front end of the chute E to drop down from itsgate, and allow the screened lump-coal to pass out of the chute, afterwhich it will reset itself, as described in the first in stancein thedischarge of coal from the chute Dand thus the apparatus will continueto work. The coal being dumped into screen A will raise up the front endof screen B and allow the coal to be discharged from the chute E, asdescribed; and coal being dropped into screen B will raise up the frontend of screen A and allow the screened coal to be discharged from chuteD. The motion of the drum to 'is controlled through the medium of thebrakelever u and the braking attachments connected therewith. The slackis discharged from the chutes G by backing in a coalca-r, which, comingin contact with projecting arms 1, will shove back the gate f and allowthe slack to run out of the chute into the car, which, being drawn away,will allow the weights 5 connected to levers n to again close the. gate.

Having thus described my improvement, what I claim as my invention is 1.A coalscreening apparatus, consisting of a series of screens and chutesprovided with gates, and operating with relation to each other, so thatthe slack shall be separated from the lump-coal, in the mannersubstantially as described.

2. The combination of the screens A and B with the slack chute O,substantially as shown and described.

3. The slack-chute 0, provided with an automatic gate, operating, withrelation to the coal-car, substantially as described.

4. The combination of the screens A and B with the chutes D and E,constructed so that the coal can be discharged from the chutes at thewill of the operator and automatically reset themselves for a secondoperation, substantially as described.

5. The screen A, chutes O and D, each provided with gates whichautomatically open and close themselves, said screen and chutes beingmade operative, substantially as herein described, and for the purposeset forth.

THOS. FARROW.

Witnesses:

JAMEs J. J OHNSTON,

JNo. D. PATTEN. (154)

